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Re: Coil Question 6/12 volt confusion


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Posted by LJD on December 03, 2011 at 10:32:17 from (67.142.130.35):

In Reply to: Coil Question 6/12 volt confusion posted by Nebraska Cowman on December 03, 2011 at 09:33:03:

Yes, the vast majority of 12 volt systems in the USA use what you are calling a "6 volt" coil. More then 75% of all cars and trucks with breaker points used that style. Same coil in a Deere 6 volt tractor is used in a Deere 12 volt tractor.

A 12 volt system has to make spark at 9 volts when cranking and at 13-14 volts when running. So various systems use differing strategies to accomplish the task. Ballast resistors, differing values in the primary and secondary windings, etc.

If you look closely, many 12 volt coils for sale also list usage for 6 volt systems.

The so-called "12 volt" coils have a higher resistance in the primary windings inside the coil and thus do not use an external resistor.


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